Their sole purpose is to be killed for organic polymer, but you can tame and breed them for it:
Tame a whole bunch of them (you only need one male), and a dimetrodon and pelagornis.
Level the dimetrodon's melee damage a whole bunch and put it in a cage surrounded by penguins set to mating. Put the pelagornis in with them at set it to aggressive, the dimetrodon will incubate the penguin eggs and the pelagornis will immediately kill them when they hatch, free organic polymer factory.
Put a male in middle, at least three females surrounding it, put sloped ramps so fermented eggs fall down. Put something that has good weight reduction and or good farming for organic polymer, it will kill babies
Tame a bunch and make a penguin farm for poly. Nine females to one male works great. Set up a bunch of ACs and have them on wander when the babies hatch club them. Free poly within the comfort of your own base!
A swarm of these in the water teams up AMAZINGLY with a Baryonyx! Use the stun attack on Alpha Sharks or Alpha Carno and watch as your team of Tuxedo hitmen nips them into a surprised-looking skeleton. Its hilarious.
They are so cute! I tamed one today and I named it Karri. She is a juvenile and very weak but still cute. If you kill baby or juvenile kairukus on purpose. I will find and burn your base in multiplayer.